1、hair, a hair, hairs
hair指人或動物的“頭發(fā)，毛發(fā)”。hair可指人或動物的全部“頭發(fā)，毛發(fā)”，強(qiáng)調(diào)整體。作此解時，它是不可數(shù)名詞。充當(dāng)主語，用單數(shù)形式。如： What lovely hair the girl has!那女孩的頭發(fā)真美！ My mother's black hair was going gray.我媽媽的黑發(fā)正在變白。
a hair是指“一根頭發(fā)或毛發(fā)”，此時的hair是可數(shù)名詞的單數(shù)形式。如： I found a long golden hair on the tablecloth.我在桌布上發(fā)現(xiàn)一根金發(fā)。 The little boy has got a white hair on his head.這個小男孩的頭上有一根白發(fā)。
hairs指“多根頭發(fā)或毛發(fā)”，它是可數(shù)名詞的復(fù)數(shù)形式，其前可有數(shù)詞或表示數(shù)量的a few, several, many等詞修飾。如： The cat has left its hairs all over my clothes.那只貓粘得我衣服上都是貓毛。 My aunt has a few gray hairs.我的嬸嬸已有幾根白發(fā)。
2、hand on, on hand
hand on是一動副型短語動詞，一般用作及物動詞，表示“傳下去；轉(zhuǎn)交”等意思。例如：Everyone in class should read this, so when you have finished, please hand it on.班上每個人都應(yīng)把這看一下，所以你看完后，請往下傳。
That family trait is handed on from father to son.那種家風(fēng)是父子相傳的。
Would you hand on this telegram to your friend?你把這份電報轉(zhuǎn)交給你的朋友好嗎？
on hand是一習(xí)語，在句中作表語或狀語，意為“現(xiàn)有在手頭的；準(zhǔn)備好了的”和“在近處，
hair指人或動物的“頭發(fā)，毛發(fā)”。hair可指人或動物的全部“頭發(fā)，毛發(fā)”，強(qiáng)調(diào)整體。作此解時，它是不可數(shù)名詞。充當(dāng)主語，用單數(shù)形式。如： What lovely hair the girl has!那女孩的頭發(fā)真美！ My mother's black hair was going gray.我媽媽的黑發(fā)正在變白。
a hair是指“一根頭發(fā)或毛發(fā)”，此時的hair是可數(shù)名詞的單數(shù)形式。如： I found a long golden hair on the tablecloth.我在桌布上發(fā)現(xiàn)一根金發(fā)。 The little boy has got a white hair on his head.這個小男孩的頭上有一根白發(fā)。
hairs指“多根頭發(fā)或毛發(fā)”，它是可數(shù)名詞的復(fù)數(shù)形式，其前可有數(shù)詞或表示數(shù)量的a few, several, many等詞修飾。如： The cat has left its hairs all over my clothes.那只貓粘得我衣服上都是貓毛。 My aunt has a few gray hairs.我的嬸嬸已有幾根白發(fā)。
2、hand on, on hand
hand on是一動副型短語動詞，一般用作及物動詞，表示“傳下去；轉(zhuǎn)交”等意思。例如：Everyone in class should read this, so when you have finished, please hand it on.班上每個人都應(yīng)把這看一下，所以你看完后，請往下傳。
That family trait is handed on from father to son.那種家風(fēng)是父子相傳的。
Would you hand on this telegram to your friend?你把這份電報轉(zhuǎn)交給你的朋友好嗎？
on hand是一習(xí)語，在句中作表語或狀語，意為“現(xiàn)有在手頭的；準(zhǔn)備好了的”和“在近處，